垂直于双材料非完美界面的裂纹断裂分析  

Fracture Analysis of Crack Perpendicular to an Imperfect Bimaterial Interface

作　　者：杨焕强 王瑞和 周卫东 

机构地区：[1]中国石油大学石油工程学院,东营257000

出　　处：《科学技术与工程》2013年第35期10450-10454,共5页Science Technology and Engineering

基　　金：国家自然科学基金(50974130)资助

摘　　要：当垂直裂纹到达两种材料界面时,其进一步的扩展受多种因素影响。采用线性弹簧模型模拟两种材料间的非完美界面,用能量释放率作为描述裂纹扩展的参量,结合有限元方法与虚拟裂纹闭合技术(VCCT),提出了一种垂直于双材料非完美界面裂纹扩展能量释放率的计算方法;研究分析了能量释放率的影响因素。结果表明,界面参数对能量释放率有较大影响,尤其是沿裂纹法线方向的界面参数对能量释放率影响更大,存在上、下临界的界面参数,当界面参数大于上临界值或小于下临界值时,能量释放率达到极值,基本不受界面参数的影响;当裂纹在较软材料内时,能量释放率随着裂纹逐渐靠近界面而减小,反之,能量释放率增大;能量释放率随材料二弹性模量的增大而减小,随外载荷及裂纹长度的增大而增大,且外载荷及裂纹长度越大,能量释放率的增幅越大。When the vertical crack propagating to the interface of different formation, many factors have great influence to the crack propagation path. A linear spring layer model is used to simulate imperfect interface and use energy release rate to describe fracture propagation. The energy release rate is calculated and the change law of energy release rate on the different conditions is analyzed based on the Virtual Crack Closure Technique （VCCT） and Finite Element Method（FEM）. The influence factors to energy release rate are researched and analysised.The results show that the energy release rate on the condition of imperfect interface is related to interface parameter. It changes between the results on the condition of perfect interface and separated interface. The energy release rate decreases with the increase of elastic modulus of material Ⅱ,and increases with the increase of external load and crack length.Meanwhile,the increase amplitude of energy release rate is bigger when the external load and crack length become bigger.

关 键 词：非完美界面 能量释放率 虚拟裂纹闭合技术 界面参数 弹簧模型 

分 类 号：TB12[理学—工程力学]